辫状河三角洲前缘水下分流河道精细刻画方法:以南堡凹陷M油田东一段为例Fine description method of the underwater distributary channel in a braided river delta front: A case study of the first Member of the Dongying Formation in the M Oilfield, Nanpu Depression
曲丽丽,段健,余成林,林伟强,邱宇威
摘要(Abstract):
河道单成因砂体划分精度直接影响剩余油刻画精度,进而决定了开发治理和调整的效果。以南堡凹陷M油田辫状河三角洲前缘沉积储层为例,优选地震属性刻画单一朵体边界,在辫状河三角洲前缘地质知识库约束下追踪河道主流线,采用拟声波反演技术刻画河道边界,结合动态资料验证,进行了水下分流河道的精细刻画。研究表明:M油田同期多朵体发育,单个朵体发育2~8支河道,水下分流河道宽度在80~240 m之间,最宽可达440 m,单成因砂体厚度为2.6~5.8 m,河道的宽厚比为25∶1~78∶1,动态验证资料及钻井结果的对比表明河道刻画预测精度吻合率达90%。通过河道精细刻画,提高了砂体展布方向的预测精度和剩余油刻画的精度,为后期开发治理提供了地质依据。这种对砂体边界进行逐级刻画的储层综合预测方法在复杂断块泛连通辫状河三角洲前缘储层的水下分流河道刻画方面具有一定的参考价值。
关键词(KeyWords): 辫状河三角洲前缘;水下分流河道;储层综合预测;井震结合;河道主流线;河道边界刻画;动态资料验证;南堡凹陷
基金项目(Foundation): 国家自然科学基金项目(42172144)
作者(Author): 曲丽丽,段健,余成林,林伟强,邱宇威
DOI: 10.19509/j.cnki.dzkq.tb20220645
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